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对复杂体型的平面T形低矮双坡屋面房屋的风荷载特性进行了风洞试验研究,得到了屋面风压系数以及各屋面体型系数的变化规律;采用计算流体力学软件FLUENT建立了数值风洞模型,在数值分析结果与风洞试验结果吻合良好的基础上,对影响屋面平均风压系数及体型系数的风攻角、屋面坡角、檐口高度、房屋几何尺寸和屋面形式等参数进行了详细分析。结果表明:屋面坡角和风攻角对屋面风压系数的影响显著;在不同风攻角作用下,迎风屋面屋檐及屋脊附近形成较高负压;当屋面处于背风区域时,风压系数分布较均匀;四坡屋面坡角为30°时屋脊背风区域易形成较大负压,局部更易遭受破坏。
The wind tunnel test was carried out on the wind load characteristics of complex T-shape low profile double-slope roofing houses. The wind pressure coefficient of the roof and the change rule of the roofing coefficient were obtained. The numerical wind tunnel was established by the computational fluid dynamics software FLUENT Based on the good agreement between numerical analysis and wind tunnel test results, the parameters of wind attack angle, roof angle, cornice height, house geometry and roof form that affect the average wind pressure coefficient and body coefficient of roof are detailed analysis. The results show that roof slope angle and wind attack angle have significant influence on the roof wind pressure coefficient. Under different wind angles of attack, the roof and eave of the windward roof form a higher negative pressure. When the roof is in the leeward region, the wind pressure coefficient distribution is more Even when the slope angle of the slope is 30 °, the roof leeward tends to form a larger negative pressure and the part is more vulnerable to damage.